Customers enter a Family Dollar store on Plaza Boulevard, in Kinston, N.C. Thereâs now a bidding war for Family Dollar, with Dollar General offering about $9.7 billion for the discounter in an effort to trump Dollar Treeâs bid of $8.5 billion. There's now a bidding war for Family Dollar, with Dollar General offering about $9.7 billion for the discounter in an effort to trump Dollar Tree's bid.
And in Indirect Incidence, both the IR LED and Photo diode are placed in parallel (side by side), facing both in same direction. In that fashion, when a object is kept in front of IR pair, the IR light gets reflected by the object and gets absorbed by photodiode.
Description. The Photo Ionization Detector (PID) is a portable vapor and gas detector that detects a variety of organic compounds. Photo ionization occurs when an atom or molecule absorbs light of sufficient energy to cause an electron to leave and create a positive ion.he PID is not suitable for the detection of semi-volatile compounds. The PID indicates if volatile organic compounds (VOCs) are present, but they do not identify type (unless combined with a gas chromatograph). The PID may give false positive readings for water vapor.